COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 82QAP
To determine
Force exerted on astronaut during take-off (in Newtons) and as a multiple of astronaut weight.
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The coefficient of static friction between a persons shoe and the ground is 0.80. Determine the maximum magnitude of acceleration of a 60 kg person, if he starts running on a horizontal surface from rest.
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Chapter 4 Solutions
COLLEGE PHYSICS
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- A child jumping off the monkey bars at a playground accelerates toward the ground because of the gravitational force exerted on him by the Earth. From Newtons third law, the force exerted by the Earth on the child is equal in magnitude to the force exerted by the child on the Earth. Does the Earth accelerate? Explain.arrow_forwardA box rests on the (horizontal) back of a truck. The coefficient of static friction between the box and the surface on which it rests is 0.24. What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration) in 3.0 s without having the box slide?arrow_forwardWhen you learn to drive, you discover that you need to up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and friction.arrow_forward
- It is said that Newtons first law can be derived from his second law. Explain this statement.arrow_forwardNewton’s Third Law Identity the action and reaction forces in the following situations: (a) Earth attracts the Moon, (b) a boy kicks a football, (c) a rocket accelerates upward, (d) a car accelerates forward, (e) a high jumper leaps, and (f) a bullet is shot from a gun.arrow_forwardIf a constant, nonzero force is applied to an object, what can you say about the velocity and acceleration of the object?arrow_forward
- A dockworker loading crates on a ship finds that a 20.0-kg crate, initially at rest on a horizontal surface, requires a 75.0-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60.0 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.arrow_forwardA rocket sled accelerates at a rate of 49.0m/s2 . Its passenger has a mass of 75.0 kg. (a) Calculate the horizontal component of the force the seat exerts against his body. Compare this with his weight using a ratio. (b) Calculate the direction and magnitude of the total force the seat exerts against his body.arrow_forwardSuppose the mass of a fully loaded module in which astronauts take off from the Moon is 10,000 kg. The thrust of its engines is 30,000 N. (a) Calculate its the magnitude of acceleration in a vertical takeoff from the Moon. (b) Could it lift off from Earth? If not, why not? If it could, calculate the magnitude of its acceleration.arrow_forward
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